package com.data.ferry.service;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @Auther: Administrator
 * @Date: 2019/11/6 00:16
 * @Description: 添加websocket服务端
 */
@ServerEndpoint("/websoket/{sid}")
@Component
@Slf4j
public class WebSocketServer {

    //静态变量，用于记录当前在线连接数，应该把它设置成线程安全的
    private static int onlineCount =0;

    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;

    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet();

    //接收sid
    private String sid="";

    /**
     * 连接建立成功调用的方法
     * @param session
     * @param sid
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("sid") String sid){
        this.session = session;
        webSocketSet.add(this);//加入set中
        addOnlineCount();//在线数加1
        log.info("有新窗口，开始监听："+sid+",当前在线人数为:"+getOnlineCount());
        this.sid = sid;
        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            e.printStackTrace();
            log.error("websocket IO异常");
        }
    }

    /**
     *连接关闭调用方法
     */
    @OnClose
    public void onClose(){
        webSocketSet.remove(this);//从set中删除
        subOnlineCount();//在线数减1
        log.info("有一个连接关闭！当前在线人数为："+getOnlineCount());
    }

    /**
     * 收到客户端发送的消息后调用的方法
     * @param message 客户端发送来的消息
     * @param session
     */
    @OnMessage
    public void onMessage(String message,Session session){
        log.info("收到来自窗口："+sid+"的消息："+message);

        //群发消息
        for(WebSocketServer item:webSocketSet){
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @OnError
    public void onError(Session session,Throwable error){
        log.error("发生错误");
        error.printStackTrace();
    }

    public static void sendInfo(String message,@PathParam("sid") String sid){
        log.info("推送消息到窗口："+sid+",推送内容："+message);
        for(WebSocketServer item:webSocketSet){
            //这里可以设置只推送给这个sid的，为null则全部推送
            try {
                if(sid==null){
                    item.sendMessage(message);
                }else if(item.sid.equals(sid)){
                    item.sendMessage(message);
                }
            }catch (Exception ex){
                continue;
            }
        }
    }

    /**
     * 实现服务器主动推送消息
     * @param msg
     * @throws IOException
     */
    public void sendMessage(String msg) throws IOException {
        this.session.getBasicRemote().sendText(msg);
    }


    public static synchronized void addOnlineCount(){
        WebSocketServer.onlineCount++;
    }
    public static synchronized void subOnlineCount(){
        WebSocketServer.onlineCount--;
    }

    public static synchronized int getOnlineCount(){
        return onlineCount;
    }

    public static CopyOnWriteArraySet<WebSocketServer> getWebSocketSet(){
        return webSocketSet;
    }

}
